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Transition Regime Fracture Toughness-temperature Properties of two Advanced Ferriticmartensitic Steels

Published online by Cambridge University Press:  21 March 2011

Philippe Spätig ,
Eric Donahue ,
George R. Odette ,
Glenn E. Lucas  and
Max Victoria
Philippe Spätig
Affiliation:
Fusion Technology, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, CH-5232 Villigen PSI, SWITZERLAND
Eric Donahue
Affiliation:
Department of Mechanical and Environmental Engineering, University of California, Santa Barbara, CA 93106-5080, U.S.A.
George R. Odette
Affiliation:
Department of Mechanical and Environmental Engineering, University of California, Santa Barbara, CA 93106-5080, U.S.A.
Glenn E. Lucas
Affiliation:
Department of Mechanical and Environmental Engineering, University of California, Santa Barbara, CA 93106-5080, U.S.A.
Max Victoria
Affiliation:
Fusion Technology, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, CH-5232 Villigen PSI, SWITZERLAND
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Abstract

Advanced martensitic steels are leading candidate materials for fusion reactor structural components due to their resistance to void swelling, and good balance of physical and mechanical properties. However, irradiations at temperatures below about 400°C result in increases in the cleavage-to-microvoid coalescence transition temperature, as well as reductions in the upper-shelf tearing toughness. This paper reports on the transition regime fracture toughness properties of two unirradiated 7-9Cr martensitic alloys, F82H and T91. Effective fracture toughness-temperature curves, Ke(T), were measured in the transition regime using relatively small pre-cracked specimens. Three sets of data obtained on different specimen sizes and geometries for the two steels are analyzed. All the data can be placed on a single so-called master-curve, when shifts due to size/geometry and material are taken into account. The results from mechanical tests, finite element method (FEM) simulations of crack tip fields and confocal microscopy-fracture reconstruction observations are presented. The link between the different mechanisms taking place at various length scales, resulting in the complex process of cleavage fracture, is discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 653: Symposium Z – Multiscale Modeling of Materials-2000 , 2000 , Z7.8.1
Copyright
Copyright © Materials Research Society 2001

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